package com.example.teaculture.tools;
import android.content.Context;

import java.io.File;
import java.math.BigDecimal;
import java.text.DecimalFormat;

public class FileCacheUtils {
  private static DecimalFormat df;


  public static String getCacheSize(File file) throws Exception {
    return getFormatSize(getFolderSize(file));
  }

  public static String getFormatSize(double size) {
    //保留两位小数
    df = new DecimalFormat("0.00");
    double kiloByte = size / 1024;
    String format = df.format(size);
    if (kiloByte < 1) {
      return format + "B";
    }

    double megaByte = kiloByte / 1024;
    if (megaByte < 1) {
      BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
      return result1.setScale(2, BigDecimal.ROUND_HALF_UP)
        .toPlainString() + "K";
    }

    double gigaByte = megaByte / 1024;
    if (gigaByte < 1) {
      BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
      return result2.setScale(2, BigDecimal.ROUND_HALF_UP)
        .toPlainString() + "M";
    }

    double teraBytes = gigaByte / 1024;
    if (teraBytes < 1) {
      BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
      return result3.setScale(2, BigDecimal.ROUND_HALF_UP)
        .toPlainString() + "G";
    }
    BigDecimal result4 = new BigDecimal(teraBytes);
    return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
      + "T";
  }

  // 获取文件
  //Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/ 目录，一般放一些长时间保存的数据
  //Context.getExternalCacheDir() --> SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据
  public static long getFolderSize(File file) throws Exception {
    long size = 0;
    try {
      File[] fileList = file.listFiles();
      for (int i = 0; i < fileList.length; i++) {
        // 如果下面还有文件
        if (fileList[i].isDirectory()) {
          size = size + getFolderSize(fileList[i]);
        } else {
          size = size + fileList[i].length();
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    return size;
  }

  public static void cleanInternalCache(Context context) {
    deleteFilesByDirectory(context.getCacheDir());
  }

  //删除方法 这里只会删除某个文件夹下的文件，如果传入的directory是个文件，将不做处理
  private static void deleteFilesByDirectory(File directory) {
    if (directory != null && directory.exists() && directory.isDirectory()) {
      for (File item : directory.listFiles()) {
        item.delete();
      }
    }
  }

}
